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Finding the Fourth Proportional to 619.50, 928.86 and 208.67

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Solution

The fourth proportional to 619.50, 928.86 and 208.67 is: 312.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.50 : 928.86 = 208.67 : x
  2. Step 2: Convert to fraction form
    619.50/928.86 = 208.67/x
  3. Step 3: Cross multiply
    619.50x = 928.86 × 208.67
  4. Step 4: Simplify right side
    619.50x = 193,820.57
  5. Step 5: Solve for x
    x = 193,820.57/619.50
  6. Step 6: Final answer
    x = 312.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.